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About Projection Transform

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perspective transform maps the view frustum

into a rectangle with depth

each point on the rectangle maps

to everything in world space

that could be behind that pixel

ie: something small close up

or something big along way away

imagine each pixel is a window into the 3D world

like a real window one meter wide

it can show something close up to one meter wide

but a mountain range could be 10 thousand meter's wide

both visible in the same window

the Z coordinate of each pixel represents how far
from the camera that vertex is

hope that helps

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Quote:
Original post by skytiger
perspective transform maps the view frustum

into a rectangle with depth

each point on the rectangle maps

to everything in world space

that could be behind that pixel

ie: something small close up

or something big along way away

imagine each pixel is a window into the 3D world

like a real window one meter wide

it can show something close up to one meter wide

but a mountain range could be 10 thousand meter's wide

both visible in the same window

the Z coordinate of each pixel represents how far
from the camera that vertex is

hope that helps


It helps, so this window is near-plane of the frustum, right?

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